CA2661379C - Apparatus and method of controlled delay packet forwarding - Google Patents
Apparatus and method of controlled delay packet forwarding Download PDFInfo
- Publication number
- CA2661379C CA2661379C CA2661379A CA2661379A CA2661379C CA 2661379 C CA2661379 C CA 2661379C CA 2661379 A CA2661379 A CA 2661379A CA 2661379 A CA2661379 A CA 2661379A CA 2661379 C CA2661379 C CA 2661379C
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- CA
- Canada
- Prior art keywords
- packet
- class
- time
- controlled delay
- transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/28—Flow control; Congestion control in relation to timing considerations
- H04L47/283—Flow control; Congestion control in relation to timing considerations in response to processing delays, e.g. caused by jitter or round trip time [RTT]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
- H04L47/56—Queue scheduling implementing delay-aware scheduling
- H04L47/564—Attaching a deadline to packets, e.g. earliest due date first
Abstract
An apparatus (302) and method are described for forwarding of packets (542) with controlled delay. In one embodiment, the invention includes controlled delay queuing logic (508) to hold a packet in a first class for a queuing time of at least a controlled delay value, and scheduling logic (514) to determine whether to delay transmission of a packet in a second class to allow the transmission of the packet in the first class when the queuing time reaches the controlled delay value.
Claims (28)
1. An apparatus comprising:
controlled delay queuing logic configured to hold a packet in a first class for a queuing time of a predetermined controlled delay value;
scheduling logic configured to delay transmission of the packet in the first class until the queuing time reaches the predetermined controlled delay value;
the scheduling logic configured to schedule transmission of a packet in a second class in response to determining that the transmission of the packet in the second class would complete before the queuing time reaches the predetermined controlled delay value;
the scheduling logic configured to schedule transmission of a packet in a pre-emptive priority class of higher priority than the first class and the second class, and the controlled delay queuing logic being configured to drop the packet in the first class if the queuing time exceeds the predetermined controlled delay value.
controlled delay queuing logic configured to hold a packet in a first class for a queuing time of a predetermined controlled delay value;
scheduling logic configured to delay transmission of the packet in the first class until the queuing time reaches the predetermined controlled delay value;
the scheduling logic configured to schedule transmission of a packet in a second class in response to determining that the transmission of the packet in the second class would complete before the queuing time reaches the predetermined controlled delay value;
the scheduling logic configured to schedule transmission of a packet in a pre-emptive priority class of higher priority than the first class and the second class, and the controlled delay queuing logic being configured to drop the packet in the first class if the queuing time exceeds the predetermined controlled delay value.
2. The apparatus of claim 1, further comprising time-stamping logic configured to attach time-stamp information including a time value to the packet in the first class, the time value indicating the time that the packet in the first class is received at the time-stamping logic, the queuing time starting at the time value and ending at the predetermined controlled delay value after the time value.
3. The apparatus of claim 1, wherein the scheduling logic is configured to determine whether to delay transmission of a packet in a third class to allow the transmission of the packet in the first class when the queuing time reaches the controlled delay value.
4. The apparatus of claim 3, wherein the scheduling logic is configured to schedule transmission of the second class of packets with strictly higher priority than transmission of the third class of packets.
5. The apparatus of claim 1, wherein the predetermined controlled delay value is configurable.
6. The apparatus of claim 1, wherein the predetermined controlled delay value is greater than a maximum transmission unit interval plus an inter-packet gap interval.
7. The apparatus of claim 1, further comprising time-stamping logic configured to attach time-stamp information to a packet.
8. The apparatus of claim 7, wherein the controlled delay queuing logic is configured to access the time-stamp information as part of determining when the queuing time reaches the predetermined controlled delay value.
9. The apparatus of claim 1, further comprising policing logic configured to determine whether to send a packet to the controlled delay queuing logic.
10. The apparatus of claim 1, wherein the first class of packets comprise network timing packets.
11. The apparatus of claim 1, further comprising shaping logic configured to shape packets in the pre-emptive priority class.
12. The apparatus of claim 1, further comprising policing logic configured to police packets in the pre-emptive priority class.
13. A method comprising:
transmitting a packet in a pre-emptive priority class of higher priority than a first class and a second class;
dropping a packet in the first class if transmission of the packet in the pre-emptive priority class completes after a queuing time of the packet in the first class exceeds a predetermined controlled delay value;
delaying transmission of the packet in the first class until the queuing time reaches the predetermined controlled delay value;
determining whether to delay transmission of a packet in the second class to allow the transmission of the packet in the first class when the queuing time reaches the predetermined controlled delay value; and scheduling transmission of the packet in the second class in response to determining that transmission of the packet in the second class would complete before the queuing time reaches the predetermined controlled delay value.
transmitting a packet in a pre-emptive priority class of higher priority than a first class and a second class;
dropping a packet in the first class if transmission of the packet in the pre-emptive priority class completes after a queuing time of the packet in the first class exceeds a predetermined controlled delay value;
delaying transmission of the packet in the first class until the queuing time reaches the predetermined controlled delay value;
determining whether to delay transmission of a packet in the second class to allow the transmission of the packet in the first class when the queuing time reaches the predetermined controlled delay value; and scheduling transmission of the packet in the second class in response to determining that transmission of the packet in the second class would complete before the queuing time reaches the predetermined controlled delay value.
14. The method of claim 13, further comprising:
time-stamping the packet in the first class with time-stamp information including a time value, the time value indicating a time that the packet in the first class is received; and determining the queuing time based on the time-stamp information, the queuing time starting at the time value and ending at the predetermined controlled delay value after the time value.
time-stamping the packet in the first class with time-stamp information including a time value, the time value indicating a time that the packet in the first class is received; and determining the queuing time based on the time-stamp information, the queuing time starting at the time value and ending at the predetermined controlled delay value after the time value.
15. The method of claim 13, further comprising determining whether to delay transmission of a packet in a third class to allow the transmission of the packet in the first class when the queuing time reaches the predetermined controlled delay value.
16. The method of claim 13, further comprising time-stamping the packet in the first class with time-stamp information that is accessed by the controlled delay queuing logic to determine the predetermined controlled delay value.
17. The method of claim 13, further comprising shaping packets in the pre-emptive priority class.
18. A method comprising:
forwarding a timing packet through at least one switching device, the forwarding at each of the at least one switching device including:
transmitting a control packet in a pre-emptive priority class of higher priority than a first class including the timing packet and a second class including a data packet;
dropping the timing packet if the transmission of the control packet completes after a queuing time of the timing packet exceeds a predetermined controlled delay value;
delaying transmission of the timing packet until the queuing time of the timing packet reaches the predetermined controlled delay value;
determining whether to delay transmission of the data packet until after the queuing time of the timing packet reaches the predetermined controlled delay value; and scheduling transmission of the data packet in response to determining that the transmission of the data packet would complete before the queuing time reaches the predetermined controlled delay value; and transmitting the timing packet to a client such that the client is synchronized.
forwarding a timing packet through at least one switching device, the forwarding at each of the at least one switching device including:
transmitting a control packet in a pre-emptive priority class of higher priority than a first class including the timing packet and a second class including a data packet;
dropping the timing packet if the transmission of the control packet completes after a queuing time of the timing packet exceeds a predetermined controlled delay value;
delaying transmission of the timing packet until the queuing time of the timing packet reaches the predetermined controlled delay value;
determining whether to delay transmission of the data packet until after the queuing time of the timing packet reaches the predetermined controlled delay value; and scheduling transmission of the data packet in response to determining that the transmission of the data packet would complete before the queuing time reaches the predetermined controlled delay value; and transmitting the timing packet to a client such that the client is synchronized.
19. The method of claim 18, further comprising:
time-stamping the timing packet with time-stamp information including a time value, the time value indicating a time that the timing packet is received;
and determining the queuing time based on the time-stamp information, the queuing time starting at the time value and ending at the predetermined controlled delay value after the time value.
time-stamping the timing packet with time-stamp information including a time value, the time value indicating a time that the timing packet is received;
and determining the queuing time based on the time-stamp information, the queuing time starting at the time value and ending at the predetermined controlled delay value after the time value.
20. An apparatus comprising:
controlled delay queuing logic configured to hold a packet in a first class for a queuing time of a predetermined controlled delay value;
scheduling logic configured to delay transmission of the packet in the first class until the queuing time reaches the predetermined controlled delay value;
the scheduling logic configured to schedule transmission of a packet in a second class in response to determining that the transmission of the packet in the second class would complete before the queuing time reaches the predetermined controlled delay value; and time-stamping logic configured to attach time-stamp information including a time value to the packet in the first class, the time value indicating the time that the packet in the first class is received at the time-stamping logic, the queuing time starting at the time value and ending at the predetermined controlled delay value after the time value.
controlled delay queuing logic configured to hold a packet in a first class for a queuing time of a predetermined controlled delay value;
scheduling logic configured to delay transmission of the packet in the first class until the queuing time reaches the predetermined controlled delay value;
the scheduling logic configured to schedule transmission of a packet in a second class in response to determining that the transmission of the packet in the second class would complete before the queuing time reaches the predetermined controlled delay value; and time-stamping logic configured to attach time-stamp information including a time value to the packet in the first class, the time value indicating the time that the packet in the first class is received at the time-stamping logic, the queuing time starting at the time value and ending at the predetermined controlled delay value after the time value.
21. The apparatus of claim 20, wherein the predetermined controlled delay value is independent of the time value.
22. The apparatus of claim 20, wherein the scheduling logic is configured to determine whether to delay transmission of a packet in a third class to allow the transmission of the packet in the first class when the queuing time reaches the controlled delay value.
23. The apparatus of claim 22, wherein the scheduling logic is configured to schedule transmission of the second class of packets with strictly higher priority than transmission of the third class of packets.
24. The apparatus of claim 20, wherein the predetermined controlled delay value is configurable.
25. The apparatus of claim 20, wherein the predetermined controlled delay value is greater than a maximum transmission unit interval plus an inter-packet gap interval.
26. The apparatus of claim 20, wherein the controlled delay queuing logic is configured to access the time-stamp information as part of determining when the queuing time reaches the predetermined controlled delay value.
27. The apparatus of claim 20, further comprising policing logic configured to determine whether to send a packet to the controlled delay queuing logic.
28. The apparatus of claim 20, wherein the first class of packets comprise network timing packets.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US83946506P | 2006-08-22 | 2006-08-22 | |
| US60/839,465 | 2006-08-22 | ||
| PCT/US2007/076484 WO2008024818A2 (en) | 2006-08-22 | 2007-08-22 | Apparatus and method of controlled delay packet forwarding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2661379A1 CA2661379A1 (en) | 2008-02-28 |
| CA2661379C true CA2661379C (en) | 2014-10-14 |
Family
ID=39107620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2661379A Expired - Fee Related CA2661379C (en) | 2006-08-22 | 2007-08-22 | Apparatus and method of controlled delay packet forwarding |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US7590061B2 (en) |
| EP (2) | EP3319251B1 (en) |
| JP (1) | JP5140079B2 (en) |
| CN (1) | CN101548494B (en) |
| CA (1) | CA2661379C (en) |
| WO (1) | WO2008024818A2 (en) |
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-
2007
- 2007-08-22 WO PCT/US2007/076484 patent/WO2008024818A2/en active Application Filing
- 2007-08-22 CA CA2661379A patent/CA2661379C/en not_active Expired - Fee Related
- 2007-08-22 EP EP17200013.5A patent/EP3319251B1/en active Active
- 2007-08-22 JP JP2009525751A patent/JP5140079B2/en not_active Expired - Fee Related
- 2007-08-22 CN CN2007800372765A patent/CN101548494B/en active Active
- 2007-08-22 US US11/843,493 patent/US7590061B2/en active Active
- 2007-08-22 EP EP07814338.5A patent/EP2090003B1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| US7590061B2 (en) | 2009-09-15 |
| EP3319251A8 (en) | 2018-07-18 |
| CN101548494B (en) | 2013-08-21 |
| WO2008024818A3 (en) | 2008-09-04 |
| EP2090003B1 (en) | 2017-12-13 |
| WO2008024818A2 (en) | 2008-02-28 |
| EP3319251B1 (en) | 2020-01-29 |
| CA2661379A1 (en) | 2008-02-28 |
| EP2090003A2 (en) | 2009-08-19 |
| EP2090003A4 (en) | 2012-11-28 |
| JP2010502122A (en) | 2010-01-21 |
| JP5140079B2 (en) | 2013-02-06 |
| EP3319251A1 (en) | 2018-05-09 |
| CN101548494A (en) | 2009-09-30 |
| US20080089364A1 (en) | 2008-04-17 |
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